Numerical Study on the Combustion Properties of Ammonia/DME and Ammonia/DMM Mixtures

Yuanpu Zhang, Qian Wang, Liming Dai (), Ming Zhang and Chunkan Yu ()
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Yuanpu Zhang: Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China
Qian Wang: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Liming Dai: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Ming Zhang: Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China
Chunkan Yu: Institute of Technical Thermodynamics, Karlsruhe Institute of Technology, Engelbert-Arnold-Str. 4, 76131 Karlsruhe, Germany

Energies, 2023, vol. 16, issue 19, 1-18

Abstract: Ammonia (NH 3 ) is considered a promising zero-carbon fuel and was extensively studied recently. Mixing high-reactivity oxygenated fuels such as dimethyl ether (DME) or dimethoxymethane (DMM) with ammonia is a realistic approach to overcome the low reactivity of NH 3 . To study the combustion characteristics of NH 3 /DMM and NH 3 /DME mixtures, we constructed a NH 3 /DMM chemical mechanism and tested its accuracy using measured laminar burning velocity (LBV) and ignition delay time (IDT) of both NH 3 /DMM and NH 3 /DME mixtures from the literature. The kinetic analysis of NH 3 /DMM flames using this mechanism reveals that the CH 3 radicals generated from the oxidation of DMM substantially affects the oxidation pathway of NH 3 at an early stage of flame propagation. We investigated the formation of nitrogen oxides (NO x ) in NH 3 /DMM and NH 3 /DME flames and little difference can be found in the NO x emissions. Using NH 3 /DMM flames as an example, the peak NO x emissions are located at an equivalence ratio ( φ ) of 0.9 and a DMM fraction of 40% in the conditions studied. Kinetic analysis shows that NO x emission is dominated by NO, which primarily comes from fuel nitrogen of NH 3 . The addition of DMM at 40% significantly promotes the reactive radical pool (e.g., H, O, and OH) while the maintaining a high concentration of NO precursors (e.g., HNO, NO 2, and N 2 O), which results in a high reaction rate of NO formation reaction and subsequently generates the highest NO emissions.

Keywords: ammonia; dimethyl ether; dimethoxymethane; combustion mechanism; NO x emission (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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